Steam boiler



A. M KEE July, 23, 1935.

STEAM BOiLER Filed July 15, 1954 W W A. w a am .2

BY 22 Z ATTORNEY on opposit Patented July UNITED STATES PATENT OFFICE.

STEAM BOILER 7 Andrew McKee, deceased, late of Ossining, N. Y'.,

by Charlotte Nelson Anderson,

Ossining, N. Y.

administratrix,

Application July 13, 1934, Serial No. 734,888

5 Claims.

This invention relates to certain improvements in steam-boilers in which a plurality of double heating tubes are employed and spaced apart one within the other to provide annular water spaces jacent tubular e sides of which heat is applied by adwalls.

The objects of the invention include means for arranging the heating tubes with respect to their lengths .to afford relatively increased travel of the heated gases in the interest of efficiency.

A further object is to provide means for dis-v tributing the heat length of the outer heating tubes.

Also, means for 1 action" in a certain ,Also, to provide tension having sid ed gases over the superficial effecting a localized heating portion of theboiler. forthe boiler a fire-box exe water-walls connected with and forming part of the boiler-water circulation.

. Also, to provide for the fire-box a series of fresh-air inlets adapted to supply air heated by the circulation of thehot water contained in the fire-box water-walls. r

" Also, to provide heating means for an auxiliary water heater disposed within the boiler.

. For further comprehension of the invention, and of the objects and-advantages thereof, reference is had to the following description and acportion, of the boile r front removed to more clearly illustrate both the interior and. exterior of the boiler.

shown partially in Figure 3 is a rear elevational view of the boiler section.

a Figure 4 is an enlarged sectional detailv view showing the conne ctions between the water-legs and the double heating tubes. 7

. In the drawing, numerals i8 designate the ashpit'base of the boiler having the usual ash door H, and the upper grate-bars l3, and above is provided with a a "M having arear-bridge-wall flanges 12 which support the the latter the boiler forwardly extending fire-box l5. Thefront and side walls of the fire-box, indicated respectively in full and dotted lines by Hi and ll, constitute water-walls, the front wall thereof being formed with a pair of fire-[door openings I8. Extending above the side wa ter-walls ll are the opposite main side walls Ila of the. between the opposite ends pair of front and'rear water-legs boiler, and disposed of the latter are a 59 and spaced apart from each other in parallel relation and pitched at their upperends toward the rear of the boiler. ,As thus positioned the water-legs form between the opposite end walls of the boiler, front, rear and intermediate transverse flue sections adapted to pass the heated gases. In

construction the water-legs outer tube sheets 2| and 22 comprise inner and secured together in spaced relation to provide water and steam passages 19a and 20a.

Connecting the opposite and arranged in water-legs together,

upper and lower series, are a plurality of double heating tubes 24 and 2'5 disposed one within the other in spaced relation to provide. annular water 'andsteam passages 26 therebetween which cornmunicate with the passagesv 19a and 20aof the water-legs, the opposite ends vof-the outer and inner tubes being respectivelyjointe'd to the tube-sheets 2i and 22, as

indicated'in Fig. 4, the'inner tubes being enlargedat the front ends 21;; to provide means whereby the several tube ends may be readily expanded into correspondingperforations in their respective tube-"sheets, and also to afford means for conveniently renewing defective tubes by the insertion of'the outer tubes through the perforations or the enlarged ends in the usual manner.

Leading into the lower'end of the rear waterleg .20 are a, plurality of boiler-water circulating pipes 21', and-leading from the upper end of front water-leg lfl-are a plurality of horizontal steam and water tubes 28 connected to the steam and water drum '29, and. from the vertical circulating the hot-water chamber hich latter descend pipes 38 .that lead into 3| which inturn leads through pipes 32 to the circulating pipes 21, thus forming ajcomplete circuit for the boiler-water and steam thatoperate through the double heating tubestoafford a continuous and rapid circulation uhdertheinfluence of a moderate degree 'ofheat from gases of combustion.

.For confining the flow of hot gases above the grate-bars a base wall 33 is provided and formed with-a transverse foundation wall 34 for supporting the rear water-leg 20, the base wall being also joined to the rear end. wall 35 which in turn is joined tothe steam and water drum 2% the latter being also joined to the top wall 36, which also in turn connects the front the opposite upper extensio door-frame 3'! and ns of the side walls Ila. I-Iingedly secured to the door-frame 31 are a pair of doors 38 arrange d to be opened and closed and adapted in conjunction with the front water-leg to form the front flue 45 for the passage of the gases.

A top wall 33 is also provided for the fire-box extension l4 and. is carried by a row of double tubes 40 and 4i spaced apart one within the other to leave an annular water and steam space therebetween, the opposite ends of the larger tubes 40 being connected to the opposite Walls that include the bottom portion of the tube-sheet 22 of waterleg 49 and the inner wall of the front water-wall 18, whereby steam and water connection is provided between said water-leg and the communicating front and side water-walls of the fire-box, while the inner tubes 4| are secured at their inner ends to the inner tube-sheet 2| of the waterleg is and their outer ends to the outer wall of the water-wall 56, the smaller tubes being spaced centrally of the larger ones and serving as inlets to admit heated. fresh air into the fire-box to increase combustion therein, and also acting to absorb a portion of heat from the boiler-water circulation.

Within and closely secured between its opposite side walls the boiler is provided with a horizontal division plate 42 that extends rearwardly from the rear water-leg 20 to the rear wall of the boiler and serves to divide the double heating tubes 24 and 25 into upper and lower series with respect to the flow of gases through the inner tubes 25, and to form upper and lower rear flue sections 43a and 44 respectively alined with the upper and lower series of the inner heating tubes for the passage of hot gases. From the fire-box I4 the gases flow upwardly through the intermediate flue 43 between and around the exterior surfaces of the outer heating tubes 24 to the upper portion of said flue, thence rearwardly and downwardly over the top of the rear water-leg 20 to react against the division plate and forcibly impinge and effect a localized heating action against the upper surface of the division plate and against the cylindrical outer surfaces of the steam drum 29 and the hot-water chamber 3| whereby the accumulation of the gases serve to superheat the several contacting parts. From the division plate the gases flow forwardly through the upper series of inner tubes 25 and into the front flue 45 from which they pass downwardly and rearwardly through the lower series of inner tubes to the lower rear flue section 44 disposed below said division plate 42, and from which lower flue section the spent gases are discharged through the smoke flue 46 of the rear boiler-wall 35.

At the upper end of the water-leg I9 and extending transversely therethrough is a row of tubes 41 forming gas passages leading between the front flue 45 and the intermediate flue 43 that acts to deflect a portion of the gases from the latter flue into the former and thus tend to equalize the flow and heating effect of the gases over the lengths of the heating tubes.

Supported exteriorly of the boiler is indicated a house radiator 48 having a steam supply pipe 45 leading from the boiler and a drain or feedwater pipe 50 discharging back into the boiler through the circulating pipe 21, the latter being arranged in connection with the relatively smaller pipe 32 to form an injector nozzle, shown in dotted lines, actuated by the velocity of the boiler water to create a suction on the drain pipe 50.

As herein shown the hot-water chamber 3| forming a part of the boiler-water circulating system, is provided with a header projecting exteriorly of the boiler and formed with a pair of separate compartments having outer pipe connections 5la and 5H2 that communicate through the compartments to the opposite ends of the auxiliary water-heating coil 52, shown in dotted lines within the chamber. The opposite ends of the outer pipes Ma and Eli) are connected to the water-storage tank 53 in the usual manner, as are also the respective cold-water supply and hotwater discharge pipes 53a and 531).

A relatively free passage of the heated gases at the upper end of the intermediate flue into the rear upper flue section 43a of the boiler is provided by the inclination of the upper row of heating tubes with respect to the top wall of the boiler which affords a gradually increasing flue area from the front to the rear water-legs to substantiall insure a collection of gases that serve to superheat the water circulation in its passage through the rear upper flue section.

The hot-water chamber 3| forming a casing for the auxiliary heater coil 52 is disposed adjacent the upper surface of the division plate 42 and within the direct range of the path of the hot gases that tend to build up at this point a rela-' tively concentrated heating condition that-has the effect of more rapidly heating and retaining the same in the added heater than would occur in ordinary conditions without the aid of said division plate. And also by the use of the latter, the path of travel of the hot gases around and through the heating tubes may be largely increased with a corresponding increase in heating surface.

What is claimed is:

1. In a steam-boiler, a fire-box, a plurality of double heating tubes arranged one within the other, in upper and lower series, front and rear water-leg connections secured to the opposite ends of said heating tubes and disposed between the opposite end walls of the boiler to form front, rear and intermediate transverse flues, a division plate disposed within said rear flue to form upper and lower rear flue sections respectively alined with the upper and lower series of inner heating tubes, the said lower flue section having a smoke flue, whereby the heated gases from the fire-box pass upwardly through the intermediate flue, between the front and rear water-legs and around and between the outer surfaces of the upper and lower series of outer heating tubes, thence rearwardly and downwardly through the rear upper flue section to engage as a stop said division plate,

thence forwardly through the upper series of inner heating tubes to the front flue, thence downwardly therefrom and rearwardly through the lower series of inner heating tubes to the rear lower flue section where it escapes through the smoke flue thereof.

2. In a steam boiler, a plurality of double heating tubes arranged one within the other in upper and lower series, front and rear water-leg connections secured to the opposite ends of said heating tubes and disposed between the opposite end walls of said boiler to form front, rear and intermediate transverse flues, tubular passages communicating between the front and intermediate flues at the upper end of said front'water-leg, and a division plate disposed within said rear flue to form upper and lower rear flue sections respectively alined with the upper and lower series of inner heating tubes, and effect the pas sage of the products of combustion.

3. In a steam-boiler, water-heating tubes having front and rear water-leg connections, a firebox having an extension projecting forwardly of said boiler and provided with side and front water-walls communicating with said water-legs, a top wall for said extension, means for supporting said top wall consisting of a plurality of water tubes carried at opposite ends by said front water-leg and front water-wall in water connection therewith, and air tubes extending through said water tubes and supported at opposite ends by said front water-leg and front water-wall and adapted to supply heated fresh air to said firebox.

4. In a steam-boiler, a plurality of double heating tubes arranged one within the other in upper and lower series, front and rear water-leg connections secured to the opposite ends of said heating tubes and disposed between the opposite end walls of said boiler to form front, rear and intermediate transverse flues, a division plate disposed within said rear flue to form upper and lower flue sections respectively alined with the upper and lower series of inner heating tubes and effect a localized heating action adjacent the upper surface of said division plate means forming a steam and water circulation within said boiler including a hot-water chamber enclosed in said rear upper flue adjacent said division plate, and an auxiliary water-heating coil disposed within said hot-water chamber, and water inlet and outlet connections for said coil extending outwardly of said boiler.

5. In a steam-boiler, a plurality of double heating tubes arranged one within the other in upper and lower series, front and rear water-leg connections secured to the opposite ends of said tubes and disposed between the opposite end walls of the boiler to form front, rear and intermediate transverse flues, a division plate disposed within said rear flue to form upper and lower rear flue sections respectively alined with the upper and lower series of inner heating tubes, one or more gas passages extending transversely through said front water-leg at the upper end thereof, said flues being adapted to receive the hot gases of the fire-box of the boiler and upwardly pass the same through said intermediate flue between said front and rear water-legs and around and between said outer heating tubes and distribute through the gas passages of the front water-leg to the front flue and from the intermediate flue rearwardly over the rear water-leg to the rear upper flue section and division plate.

' CHARLOTTE NELSON ANDERSON, Administratrizc of the Estate of Andrew McKee,

Deceased. 

